Finding the Fourth Proportional to 93.28, 139.89 and 39.15

Step by Step Solution

1. Step 1: Write the proportion equation
   93.28 : 139.89 = 39.15 : x
2. Step 2: Convert to fraction form
   93.28/139.89 = 39.15/x
3. Step 3: Cross multiply
   93.28x = 139.89 × 39.15
4. Step 4: Simplify right side
   93.28x = 5,476.69
5. Step 5: Solve for x
   x = 5,476.69/93.28
6. Step 6: Final answer
   x = 58.71